package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.reggie.common.R;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.entity.Employee;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

//菜品管理
@RestController
@RequestMapping("/dish")
@Slf4j
public class DishController {

    @Autowired
    private DishService dishService;

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private CategoryService categoryService;

    @Autowired
    private RedisTemplate redisTemplate;

    //新增菜品
    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto){
        log.info(dishDto.toString());

        dishService.saveWithFlavor(dishDto);

        //清理所有菜品的缓存数据
        //Set keys = redisTemplate.keys("dish_*");//获得所有以dish_开头的key
        //redisTemplate.delete(keys);

        //清理某个分类下面的菜品缓存数据
        String key="dish_"+dishDto.getCategoryId()+"_1";
        redisTemplate.delete(key);

        return R.success("新增菜品成功");
    }

    //菜品信息分页查询
    @GetMapping("/page")
    public R<Page> page(int page,int pageSize,String name){

        //构造 分页构造器对象
        Page<Dish> pageInfo=new Page<>(page,pageSize);
        Page<DishDto> dishDtoPage=new Page<>();

        //构造 条件构造器
        LambdaQueryWrapper<Dish> queryWrapper=new LambdaQueryWrapper<>();

        //添加排序条件
        queryWrapper.orderByDesc(Dish::getUpdateTime);

        //添加过滤条件
        queryWrapper.like(StringUtils.isNotEmpty(name), Dish::getName,name);

        //执行分页查询
        dishService.page(pageInfo,queryWrapper);

        //对象拷贝
        BeanUtils.copyProperties(pageInfo,dishDtoPage,"records");

        //前端页面需要的是菜品分类的名称，而Dish类中只有菜品分类的id，故要进行处理
        List<Dish> records=pageInfo.getRecords();

        List<DishDto> list = records.stream().map((item)->{
            DishDto dishDto=new DishDto();

            BeanUtils.copyProperties(item,dishDto);//拷贝其他属性

            Long categoryId=item.getCategoryId();//菜品分类id
            //根据id查询分类对象
            Category category = categoryService.getById(categoryId);


            if (category!=null) {
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);//加入菜品分类名称
            }

            return dishDto;
        }).collect(Collectors.toList());

        dishDtoPage.setRecords(list);


        return R.success(dishDtoPage);
    }

    //修改菜品信息---回显数据，根据id查询信息和对应的口味信息
    @GetMapping("/{id}")
    public R<DishDto> get(@PathVariable Long id){

        DishDto dishDto = dishService.getByIdWithFlavor(id);
        return R.success(dishDto);
    }

    //修改菜品
    @PutMapping
    public R<String> update(@RequestBody DishDto dishDto){
        log.info(dishDto.toString());

        dishService.updateWithFlavor(dishDto);

        //清理所有菜品的缓存数据
        //Set keys = redisTemplate.keys("dish_*");//获得所有以dish_开头的key
        //redisTemplate.delete(keys);

        //清理某个分类下面的菜品缓存数据
        String key="dish_"+dishDto.getCategoryId()+"_1";
        redisTemplate.delete(key);

        return R.success("修改菜品成功");
    }

    //根据条件查询对应的菜品数据
/*    @GetMapping("/list")
    public R<List<Dish>> list(Dish dish){//可以用Dish类来接收 传来的属性categoryId

        //构造查询条件
        LambdaQueryWrapper<Dish> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(dish.getCategoryId()!=null,Dish::getCategoryId,dish.getCategoryId());
        //添加条件，查询状态为 1 (启售状态) 的菜品
        queryWrapper.eq(Dish::getStatus,1);

        //添加排序字段
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(queryWrapper);

        return R.success(list);
    }*/

    @GetMapping("/list")
    public R<List<DishDto>> list(Dish dish){//可以用Dish类来接收 传来的属性categoryId
        List<DishDto> dishDtoList =null;

        //动态构造key
        String key="dish_"+dish.getCategoryId()+"_"+dish.getStatus();//eg: dish_1397844263642378242_1

        //先从redis中获取缓存数据
        dishDtoList = (List<DishDto>) redisTemplate.opsForValue().get(key);

        //如果存在，直接返回，无需查询数据库
        if (dishDtoList != null){
            return R.success(dishDtoList);
        }

        //构造查询条件
        LambdaQueryWrapper<Dish> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(dish.getCategoryId()!=null,Dish::getCategoryId,dish.getCategoryId());
        //添加条件，查询状态为 1 (启售状态) 的菜品
        queryWrapper.eq(Dish::getStatus,1);

        //添加排序字段
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(queryWrapper);

        dishDtoList = list.stream().map((item)->{
            DishDto dishDto=new DishDto();

            BeanUtils.copyProperties(item,dishDto);//拷贝其他属性

            Long categoryId=item.getCategoryId();//菜品分类id
            //根据id查询分类对象
            Category category = categoryService.getById(categoryId);


            if (category!=null) {
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);//加入菜品分类名称
            }

            //当前菜品的id
            Long dishId = item.getId();
            LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper=new LambdaQueryWrapper<>();
            lambdaQueryWrapper.eq(DishFlavor::getDishId,dishId);
            //SQL: select * from dish_flavor where dish_id=?
            List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrapper);
            dishDto.setFlavors(dishFlavorList);
            return dishDto;
        }).collect(Collectors.toList());

        //如果不存在，需要查询数据库，将查询到的菜品数据缓存到Redis
        redisTemplate.opsForValue().set(key,dishDtoList,60, TimeUnit.MINUTES);
        return R.success(dishDtoList);
    }

    //菜品 启售 或 停售
    @PostMapping("/status/{state}")
    public R<String> status(@PathVariable Integer state,@RequestParam List<Long> ids){

        List<Dish> dishes = dishService.listByIds(ids);

        for (Dish dish : dishes) {
            if (dish.getStatus()==state){
                return R.error("状态修改失败");
            }
        }

        LambdaUpdateWrapper<Dish> updateWrapper=new LambdaUpdateWrapper<>();

        updateWrapper.set(Dish::getStatus,state);
        updateWrapper.in(Dish::getId,ids);

        dishService.update(updateWrapper);

        return R.success("状态修改成功");
    }

    @DeleteMapping
    public R<String> delete(@RequestParam List<Long> ids){
        log.info("要删除的ids: {}",ids);

        dishService.removeWithDish(ids);
        return R.success("菜品状态删除成功");
    }
}
